Type 1 and type 2

HI, i stopped playing this game but now i have returnd and now i see that there is no more type1 deck and type2 deck.My question is, is there any star restriction now, or a 30 stars deck can play vs a 25 stars deck? plz answer my question. Thx

Extended 25 is T1. Standard is 25* just with cards released in last 3 years. Extended is T2.
In DT you can fight only opponents with +-5* difference even though you play in extended, that´s why you can play in DT extended with fewer than 25 star decks.